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Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering

We report the observation of photo-induced plasmon–phonon coupled modes in the group IV–VI semiconductor PbTe using ultrafast x-ray diffuse scattering at the Linac Coherent Light Source. We measure the near-zone-center excited-state dispersion of the heavily screened longitudinal optical (LO) phonon...

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Autores principales: Jiang, M. P., Fahy, S., Hauber, A., Murray, É. D., Savić, I., Bray, C., Clark, J. N., Henighan, T., Kozina, M., Lindenberg, A. M., Zalden, P., Chollet, M., Glownia, J. M., Hoffmann, M. C., Sato, T., Zhu, D., Delaire, O., May, A. F., Sales, B. C., Merlin, R., Trigo, M., Reis, D. A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Crystallographic Association 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8923709/
https://www.ncbi.nlm.nih.gov/pubmed/35311000
http://dx.doi.org/10.1063/4.0000133
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author Jiang, M. P.
Fahy, S.
Hauber, A.
Murray, É. D.
Savić, I.
Bray, C.
Clark, J. N.
Henighan, T.
Kozina, M.
Lindenberg, A. M.
Zalden, P.
Chollet, M.
Glownia, J. M.
Hoffmann, M. C.
Sato, T.
Zhu, D.
Delaire, O.
May, A. F.
Sales, B. C.
Merlin, R.
Trigo, M.
Reis, D. A.
author_facet Jiang, M. P.
Fahy, S.
Hauber, A.
Murray, É. D.
Savić, I.
Bray, C.
Clark, J. N.
Henighan, T.
Kozina, M.
Lindenberg, A. M.
Zalden, P.
Chollet, M.
Glownia, J. M.
Hoffmann, M. C.
Sato, T.
Zhu, D.
Delaire, O.
May, A. F.
Sales, B. C.
Merlin, R.
Trigo, M.
Reis, D. A.
author_sort Jiang, M. P.
collection PubMed
description We report the observation of photo-induced plasmon–phonon coupled modes in the group IV–VI semiconductor PbTe using ultrafast x-ray diffuse scattering at the Linac Coherent Light Source. We measure the near-zone-center excited-state dispersion of the heavily screened longitudinal optical (LO) phonon branch as extracted from differential changes in x-ray diffuse scattering intensity following above bandgap photoexcitation. We suggest that upon photoexcitation, the LO phonon-plasmon coupled (LOPC) modes themselves become coupled to longitudinal acoustic modes that drive electron band shifts via acoustic deformation potentials and possibly to low-energy single-particle excitations within the plasma and that these couplings give rise to displacement-correlations that oscillate in time with a period given effectively by the heavily screened LOPC frequency.
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spelling pubmed-89237092022-03-17 Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering Jiang, M. P. Fahy, S. Hauber, A. Murray, É. D. Savić, I. Bray, C. Clark, J. N. Henighan, T. Kozina, M. Lindenberg, A. M. Zalden, P. Chollet, M. Glownia, J. M. Hoffmann, M. C. Sato, T. Zhu, D. Delaire, O. May, A. F. Sales, B. C. Merlin, R. Trigo, M. Reis, D. A. Struct Dyn ARTICLES We report the observation of photo-induced plasmon–phonon coupled modes in the group IV–VI semiconductor PbTe using ultrafast x-ray diffuse scattering at the Linac Coherent Light Source. We measure the near-zone-center excited-state dispersion of the heavily screened longitudinal optical (LO) phonon branch as extracted from differential changes in x-ray diffuse scattering intensity following above bandgap photoexcitation. We suggest that upon photoexcitation, the LO phonon-plasmon coupled (LOPC) modes themselves become coupled to longitudinal acoustic modes that drive electron band shifts via acoustic deformation potentials and possibly to low-energy single-particle excitations within the plasma and that these couplings give rise to displacement-correlations that oscillate in time with a period given effectively by the heavily screened LOPC frequency. American Crystallographic Association 2022-03-14 /pmc/articles/PMC8923709/ /pubmed/35311000 http://dx.doi.org/10.1063/4.0000133 Text en © 2022 Author(s). https://creativecommons.org/licenses/by/4.0/All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle ARTICLES
Jiang, M. P.
Fahy, S.
Hauber, A.
Murray, É. D.
Savić, I.
Bray, C.
Clark, J. N.
Henighan, T.
Kozina, M.
Lindenberg, A. M.
Zalden, P.
Chollet, M.
Glownia, J. M.
Hoffmann, M. C.
Sato, T.
Zhu, D.
Delaire, O.
May, A. F.
Sales, B. C.
Merlin, R.
Trigo, M.
Reis, D. A.
Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
title Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
title_full Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
title_fullStr Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
title_full_unstemmed Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
title_short Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
title_sort observation of photo-induced plasmon–phonon coupling in pbte via ultrafast x-ray scattering
topic ARTICLES
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8923709/
https://www.ncbi.nlm.nih.gov/pubmed/35311000
http://dx.doi.org/10.1063/4.0000133
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